2.Although the instructor had already told everybody to keep quiet, whispers were still ______ spotted among the students.
(A) nocturnally
(B) valiantly
(C) copiously
(D) sporadically
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統計: A(1), B(0), C(0), D(6), E(0) #3854319
統計: A(1), B(0), C(0), D(6), E(0) #3854319